Mitsubishi Colt Ralliart. Manual — part 33
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI) <4A9>
13A-86
STEP 9. Check harness between B-53 (terminal
No. 4) oxygen sensor (rear) connector and B-106
(terminal No. 4) engine control relay connector.
NOTE: Before checking harness, check intermediate
connector B-112, and repair if necessary.
• Check power supply line for damage.
Q: Is the check result normal?
YES :
Go to Step 10 .
NO :
Repair the damaged harness wire.
STEP 10. Check harness between B-53 (terminal
No. 3) oxygen sensor (rear) connector and A-08
(terminal No. 79) engine-ECU connector or
engine-CVT-ECU connector.
• Check earthing line for damage.
Q: Is the check result normal?
YES :
Go to Step 11 .
NO :
Repair the damaged harness wire.
AK402019
3
2
1
4
Oxygen sensor (rear)
Connector: B-53
B-53 Harness side connector
AC
B-53
3
2
1
4
AK402060
B-106
J/B side
connector
B-106
Connector: B-106
J/B (front side)
AC
AK402019
3
2
1
4
Oxygen sensor (rear)
Connector: B-53
B-53 Harness side connector
AC
B-53
AK402725
77
78
79
80
81
82
83
84
92
93
94
95
96
97
98
99
85
86
87
88
89
90
91
100
101
102
103
104
105
106
115
116
117
118
119
120
121
107
108
109
110
111
112
113
114
130
131
132
133
134
135
136
122
123
124
125
126
127
128
129
72 71
74 73
76 75
R
AG
A-08
Connector:
A-08
Harness side connector
Battery
Engine-ECU <M/T> or
engine-CVT-ECU <CVT>
Main
Index
Group
TOC
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI) <4A9>
13A-87
STEP 11. M.U.T.-III diagnosis code.
• Reconfirmation of diagnosis code.
Q: Is the diagnosis code set?
YES :
Replace the engine-ECU <M/T> or
engine-CVT-ECU <CVT>.
NO :
Intermittent malfunction (Refer to GROUP
00
− How to Use
Troubleshooting/Inspection Service Points
−
How to Cope with Intermittent Malfunctions
).
Code No. P0170: Abnormal Fuel System
OPERATION
• Refer to Code No. P0201: No. 1 Injector System
• Refer to Code No. P0202: No. 2 Injector System
• Refer to Code No. P0203: No. 3 Injector System
• Refer to Code No. P0204: No. 4 Injector System
.
FUNCTION
• If the fuel system goes out of order, the fuel cor-
rection value will become larger.
• The engine-ECU <M/T> or engine-CVT-ECU
<CVT> checks whether the fuel trim value is
within a specified range.
TROUBLE JUDGMENT
Check Condition
• In learning the air-fuel ratio
Judgment Criteria
• The correction value of fuel injection amount is
too low for 5 seconds or more.
or
• The correction value of fuel injection amount is
too high for 5 seconds or more.
PROBABLE CAUSES
• Failed fuel supply system
• Failed oxygen sensor
• Failed intake air temperature sensor
• Failed engine coolant temperature sensor
• Failed manifold absolute pressure sensor
• Failed barometric pressure sensor
• Air drawn in from intake hose and inlet manifold
• Exhaust leak from exhaust manifold
• Contamination of throttle body (throttle valve por-
tion)
• Failed injector
• Failed purge control solenoid valve
• Failed EGR valve <CVT>
• Failed fuel pressure
• Failed engine-ECU <M/T> or engine-CVT-ECU
<CVT>
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III diagnosis code
Q: Is any other diagnosis code than P0170 output?
YES :
Inspection chart for diagnosis code (Refer
to
NO :
Go to Step 2 .
STEP 2. M.U.T.-III data list
• Refer to Data List Reference Table
.
a. Item 13: Intake air temperature sensor
b. Item 21: Engine coolant temperature sensor
c. Item 25: Barometric pressure sensor
d. Item 32: Manifold absolute pressure sensor
Q: Are the check results normal?
YES :
Go to Step 3 .
NO :
Perform the diagnosis code classified check
procedure for the sensor that has shown an
abnormal data value (Refer to Inspection
Chart for Diagnosis Code
STEP 3. Check for intake of air from intake hose
and inlet manifold.
Q: Is the check result normal?
YES :
Go to Step 4 .
NO :
Repair.
Main
Index
Group
TOC
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI) <4A9>
13A-88
STEP 4. Check for leakage of exhaust emission
from exhaust manifold.
Q: Is the check result normal?
YES :
Go to Step 5 .
NO :
Repair.
STEP 5. Check throttle body (throttle valve
portion) for contamination.
Q: Is the check result normal?
YES :
Go to Step 6 .
NO :
Clean throttle body (throttle valve portion)
(Refer to
).
STEP 6: M.U.T.-III data list
• Refer to Data List Reference Table
.
a. Item 11: Oxygen sensor (front)
Q: Is the check result normal?
YES :
Go to Step 7 .
NO :
Check oxygen sensor (front) (Refer to Code
No. P0130
STEP 7. Check Injector itself.
• Check Injector itself (Refer to
Q: Is the check result normal?
YES :
Go to Step 8 .
NO :
Replace injector.
STEP 8. Check purge control solenoid valve
itself.
• Check purge control solenoid valve itself (Refer
to GROUP 17
− Emission Control System −
Evaporative Emission Control System
− Purge
Control Solenoid Valve
).
Q: Is the check result normal?
YES :
Go to Step 9 <CVT> , go to Step 10 <M/T> .
NO :
Replace purge control solenoid valve.
STEP 9. Check EGR valve itself.
• Check EGR valve itself (Refer to GROUP 17 −
Emission Control System
− Exhaust Gas Recir-
culation (EGR) System
− EGR Valve (stepper
motor) Check
Q: Is the check result normal?
YES :
Go to Step 10 .
NO :
Replace EGR valve (stepper motor).
STEP 10. Fuel pressure measurement.
• Fuel pressure measurement (Refer to Fuel Pres-
sure Test
Q: Is the check result normal?
YES :
Replace engine-ECU <M/T> or
engine-CVT-ECU <CVT>.
NO :
Repair.
Main
Index
Group
TOC
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI) <4A9>
13A-89
Code No. P0201: No. 1 Injector System
AK402684
2
1
3
1
2
4
19
21
20
18
17
16
15
14
1213
11
8 9
L
10
37
52 53 54 555657585960616263646566
38 39 404142434445464748495051
22 23 24 252627282930313233343536
7
5
3
1
6
4
2
A-114
AJ
B-106
A-17
B-112
B-108
Engine
control
relay
Injector
No. 1
A-102
(MU802062)
4
6
4
1
2
2
8
No. 1 Injector Circuit
R
R
Y-V
3
1
1
1
R
Fusible link
16
20A
J/B
To engine-ECU <M/T> or
engine-CVT-ECU <CVT>
Engine-ECU <M/T> or
engine-CVT-ECU <CVT>
Wire colour code
B: Black LG: Light green G: Green L: Blue W: White Y: Yellow SB: Sky blue BR: Brown O: Orange GR: Gray
R: Red P: Pink V: Violet Pu: Purple
Main
Index
Group
TOC
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